As Knockout Week continues, the second group of amateurs get their first taste of professional cooking. They head to Theo Randall at the Intercontinental, a London restaurant awarded Best Italian in Britain in 2013, where they will be responsible for serving up every dish on the menu for a busy lunch service. As the competition hots up, who will sink and who will swim?

Afterwards, it's back to the MasterChef kitchen for an invention test to show John and Gregg just what they have learnt. In a last-chance bid to stay in the competition, each contestant must demonstrate they can invent a dish from scratch that looks and tastes exceptional. They can choose from a plentiful array of seasonal produce that ranges from the everyday to top-end ingredients. In an unexpected twist, MasterChef Professionals judge and formidable perfectionist Monica Galetti returns to help John and Gregg assess the six amateurs.

After this, another contestant will be going home. Who will crumble under the pressure and who will make it through to Friday's challenge - the gateway to this year's semi-finals?

In a competition where only the food matters, these amateurs will need to stand out to survive - taking another precious step towards being crowned MasterChef Champion 2015.